Communications system with transmitting power control and method for the same

ABSTRACT

One power control means  14  controls a transmitting power according to a control command to a mobile terminal which accesses one task when radio communication is performed with the mobile terminals in the corresponding sector, and a power control unit  15  gives a control command to each of a plurality of power control means  14  to collectively control the transmitting power to mobile terminals in a plurality of sectors, thereby for accomplishing reduction of interference and elimination of traffic maldistribution in a cell consisting of a plurality of sectors when radio communication is performed with mobile terminals for each sector.

This application is a 371 of PCT/JP01/00676 Jan. 31, 2001

BACKGROUND OF THE INVENTION

1. Technical Field

This invention is related to a communication system and a communicationmethod, and particularly to control of transmitting power.

2. Background Art

FIG. 1 shows a partial construction in a communication system of CDMA(Code Division Multiple Access), in which reference numeral 1 is a PSTN(Public Switched Telephone Network), 2 is an RNC (Radio Network controlapparatus), 3 is a plurality of BTS's (Basic Station), 4 is a mobileterminal which performs radio communication between the BTS 3, and 5 isa cell which is a range allowing communication between each BTS 3.

Now, the operation is described.

When the user of any mobile terminal 4 in a cell 5, which is capable ofradio communication by down-link transmitting power, inputs a telephonenumber to originate a call (access), the BTS 3 corresponding to the cell5 responds to the call and receives the radio signal from the mobileterminal 4. And, it identifies the mobile terminal 4 from thedemodulated signal obtained by demodulating the received radio signal,and identifies the called terminal from the telephone number containedin the demodulated signal. Then, the connection request information forthem is transmitted to the RNC 2.

RNC 2 responds to the connection request information to perform theconnection control between the originating mobile terminal 4 and thecalled terminal. That is, if the called terminal is in another network,that information is sent to the PSTN 1. Or, if the called terminal is amobile terminal 4 in the same radio network, the connection requestinformation is sent to all the accommodated BTS's 4. Each BTS 4originates a call to the mobile terminal 4 existing in the correspondingcell 5 to call the telephone number.

If the mobile terminal 4 corresponding to this telephone number existsin the cell allowing radio communication by the transmitting power ofany BTS 3, it responds to the call to notify the user of an incomingcall. And, if the user responds to the incoming call, a communicationchannel is established between the mobile terminal 4, which is thecalling terminal, and the mobile terminal 4 which is the calledterminal, and voice data is transmitted and received. If one or both incommunication move from the region of the current cell into the regionof another cell, the BTS 3 corresponding to the current cell sensesthat, and notifies the RNC 2 of the movement of the mobile terminal 4.The RNC 2 performs so-called handoff processing in response to thenotification.

Further, the RNC 2 defines the maximum reference value and the minimumreference value of the mobile terminal 4 that can access eachaccommodated BTS 3, and sends common pilot transmitting power to controlthe transmitting power to the mobile terminal. As a result, as shown inFIG. 2, the BTS 4 adjusts the radius (field strength of transmittingpower) of the corresponding cell 5. For instance, if the radius of thecell is assumed to be R1 when the number of mobile terminals 4 (referredto as “traffic number” is in a prescribed range, the radius of the cell5 is set to R2 to expand the range allowing communication if the numberof mobile terminals 4 decrease below the minimum reference value.Conversely, if the number of mobile terminals 4 exceeds the maximumreference value, the radius of the cell is set to R3 to narrow the rangeallowing communication.

FIG. 3 is a flowchart showing the operation of the cell radiusadjustment, and in the figure, it is determined whether or not thetraffic number has exceeded the maximum reference value (step ST1), andthe cell radius is reduced if exceeded (step ST2). Further, it isdetermined whether or not the traffic number had decreased below theminimum reference value (step ST3), and the cell radius is extended ifdecreased (step ST4).

However, in the above conventional communication system andcommunication method, since the radius is reduced or extended for acertain cell alone, there is a problem that interference or trafficmaldistribution in a plurality of cells occurs. Further, since themobile terminals 4 do not always concentrically exist around the BTS 3,there is a problem that traffic control is insufficient with theconventional power control by adjustment of the cell radius.

The present invention was accomplished to solve the above describedproblems, and it aims to reduce interference and eliminate trafficmaldistribution in a plurality of cells. Further, it aims to enablesufficient traffic control in a cell or in a plurality of cells.

BRIEF SUMMARY OF THE INVENTION

The communication system according to the present invention is adaptedto have a power control means for controlling a transmitting poweraccording to a control command to a mobile terminal which accesses oneradio area when radio communication is performed between the mobileterminal in the one radio area; and a collective control means forgiving the control command to each of a plurality of the power controlmeans to collectively control the transmitting power to mobile terminalsin a plurality of the radio areas.

This provides an advantage that, when radio communication is performedwith a mobile terminal for each radio area, reduction of interferenceand elimination of traffic maldistribution in a plurality of radio areascan be accomplished. Further, there is also an advantage that sufficienttraffic control can be performed in a radio area or in a plurality ofradio areas.

In the communication system according to the present invention, thepower control means is a power computing unit for computing thetransmitting power according to a control command to a mobile terminalaccessing one sector of a cell consisting of plurality of sectors whenradio communication is performed with the mobile terminals in the onesector, and the collective control means is a base station foraccommodating a plurality of power control means and giving the controlcommand to each of plurality of the power control means to collectivelycontrol the transmitting power to mobile terminals in the cell.

This provides an advantage that reduction of interference andelimination of traffic maldistribution in one cell consisting of aplurality of sectors can be accomplished when radio communication ismade between a mobile terminal for each sector. Further, there is alsoan advantage that sufficient traffic control can be performed in eachsector.

In the communication system according to the present invention, thepower control means is a base station for controlling the transmittingpower according to a control command to a mobile terminal accessing onecell when radio communication is performed with the mobile terminals inthe one cell, and the collective control means is a radio networkcontrol apparatus for accommodating a plurality of base stations andgiving the control command to each of plurality of the base stations tocollectively control the transmitting power to mobile terminals in aplurality of the cells. Further, there is also an advantage thatsufficient traffic control can be performed in each cell.

This provides an advantage that reduction of interference andelimination of traffic maldistribution in a plurality of cells can beaccomplished when radio communication is made between a mobile terminalfor each cell.

In the communication system according to the present invention, thepower control means controls the transmitting power to a mobile terminalfor each period of a slot which is a predetermined amount oftransmit-receive data, or of a frame consisting of a plurality of slots,for a common pilot channel transmitting power given from the collectivecontrol means.

This provides an advantage that the transmitting power in a plurality ofradio areas can be controlled at high speed.

In the communication system according to the present invention, thecollective control means is notified of a value of the number of mobileterminals received by each power control means, and determines thecontrol command to be given to each power control means based on thenotified value.

This provides an advantage that traffic load can be distributed in awide range.

In the communication system according to the present invention, thecollective control means gives the control command to each power controlmeans so as to prevent the occurrence of absence of transmitting powerbetween adjacent radio areas and overlapping of transmitting powerbetween the adjacent radio areas in a plurality of collectivelycontrolled radio areas.

This provides an advantage that reduction of interference andelimination of traffic maldistribution between the adjacent radio areascan be accomplished.

In the communication system according to the present invention, thecollective control means grasps information on a common pilot channeltransmitting power in each power control means, and controls a referencesignal to interference power ratio and a reference number of randomaccess channels in the each power control means.

This provides an advantage that optimum power control can be performedbetween the adjacent radio areas.

In the communication system according to the present invention, thecollective control means defines a range of the maximum value and theminimum value of the common pilot channel transmitting power in eachpower control means, and if any accommodated power control meansautonomously performs a power control in the corresponding radio area,it controls the common pilot channel transmitting power within thedefined range for a power control means corresponding to the radio areasadjacent to the radio area.

This provides an advantage that the transmitting power in an individualradio area is controlled at high speed, and reduction of interferenceand elimination of traffic maldistribution among a plurality of radioareas can be accomplished.

A communication method according to the present invention is to give acontrol command to a power control means performing radio communicationwith mobile terminals in one radio area to control a transmitting powerto each mobile terminals accessing the one radio area, thereby forcollectively controlling the transmitting power to mobile terminals in aplurality of radio areas.

This provides an advantage that reduction of interference andelimination of traffic maldistribution in a plurality of radio areas canbe accomplished when radio communication is performed between a mobileterminal for each radio area. Further, there is also an advantage thatsufficient traffic control can be performed in a radio area and in aplurality of radio areas.

In the communication method according to the present invention, thepower control means controls the transmitting power to the mobileterminal for each period of a slot which is a predetermined amount oftransmit-receive data, or of a frame consisting of a plurality of slots,for a common pilot channel transmitting power given from asuperordinate.

This provides an advantage that the transmitting power in a plurality ofradio areas can be controlled at high speed.

In the communication method according to the present invention, uponnotification of a value of the number of mobile terminals received byeach of a plurality of the power control means, a control command to begiven to each power control means is determined based on the notifiedvalue.

This provides an advantage that traffic load can be distributed in awide range.

In the communication method according to the present invention, thecontrol command is given to each of the plurality of power control meansso as to prevent the occurrence of absence of transmitting power betweenadjacent radio areas and overlapping of transmitting power between theadjacent radio areas in a plurality of collectively controlled radioareas.

This provides an advantage that reduction of interference andelimination of traffic maldistribution between the adjacent radio areascan be accomplished.

The communication method according to the present invention, informationon a common pilot channel transmitting power in each of the plurality ofpower control means are grasped to control a reference signal tointerference power ratio and a reference number of random accesschannels in each power control means.

This provides an advantage that optimum power control can be performedbetween the adjacent radio areas.

In the communication method according to the present invention, a rangesof the maximum value and minimum value of the common pilot channeltransmitting power in each of the plurality of power control means aredefined, and if any power control means autonomously performs a powercontrol in the corresponding radio area, the common pilot channeltransmitting power is controlled within the defined ranges for the powercontrol means corresponding to the radio areas adjacent to the radioarea.

This provides an advantage that the transmitting power in an individualradio area can be controlled at high speed, and reduction ofinterference and elimination of traffic maldistribution among aplurality of radio areas can be accomplished.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a diagram showing a partial construction in the conventionalCDMA communication system;

FIG. 2 is a diagram showing the adjustment of the cell radius in powercontrol by the conventional communication system;

FIG. 3 is a flowchart showing the adjustment of the cell radius in theconventional communication system;

FIG. 4 is a diagram showing the cell structure of the communicationsystem in the embodiment 1 for carrying out the present invention;

FIG. 5 is a block diagram showing the construction of the BTS of thecommunication system in the embodiment 1 for carrying out the presentinvention;

FIG. 6 is a block diagram showing the construction of the powercomputing unit in FIG. 5;

FIG. 7 is flowchart showing the operation of the communication system inthe embodiment 1 for carrying out the present invention;

FIG. 8 is a diagram showing the communication system in the embodiment 2for carrying out the present invention; and

FIG. 9 is a block diagram showing the power computing unit in the RNC inFIG. 8.

BEST MODE FOR CARRYING OUT THE INVENTION

Now, to describe the present invention in more detail, the best mode forcarrying out the present invention is described according to theaccompanying drawings.

EMBODIMENT 1

FIG. 4 is a diagram showing a cell structure of the communication systemin embodiment 1 for carrying out the present invention, and in thefigure, reference numeral 11 denotes a BTS (Base Station) connected toan RNC (Radio Network control apparatus), and 12 denotes a cellconsisting of six sectors (a plurality of radio areas) managed by theBTS 11.

FIG. 5 is a block diagram showing the construction of the BTS 11 of thecommunication system in the embodiment 1 for carrying out the presentinvention, and in the figure, reference numeral 13 denotes sixtransceiver units corresponding to the respective sectors (sectors 1 to6) of the cell 12, 14 denotes six power computing units (power controlmeans) corresponding to the respective transceiver units 13, 15 denotesa power control unit (central control means) connected to the respectivepower computing units 14, and a to d are signals to be sent and receivedinside the BTS 11 and between the RNC (not shown). FIG. 6 is a blockdiagram showing the construction of the power computing unit 14 in FIG.5, in which 16 denotes a comparator, 17 denotes a correction amountcomputing unit, 18 denotes an adder, and e and f are signals to be sentand received in the power computing unit 14.

Now, the operation is described.

Sent from the RNC, not shown, to the power control unit 15 of the BTS 11are a power indicating signal a of the common pilot channel transmittingpower (hereinafter referred to as “CPICH transmitting power”) and areference indicating signal b consisting of a reference signal tointerference power ratio (hereinafter referred to as “SIR”) and areference number of random access channels (hereinafter referred to as“reference RACH number”). That is, a control command set by thesuperordinate RNC is transmitted to the subordinate BTS 11. The powercontrol unit 15 gives the received power indicating signal a andreference indicating signal b to each of the six power computing units14. The respective power control units 14 give the power indicatingsignal a (after the correction described later, power indicating signald) to the respective corresponding transceiver units 13, and stores thereference indicating signal b in the memory (not shown) of thecomparator 16 shown in FIG. 6.

Each transceiver unit 13 controls the transmitting power to a mobile, orthe down-link transmitting power, according to the power indicatingsignal a. For instance, in urban areas where the number of mobileterminals existing in the corresponding sector is large, the range ofthe sector or the transmitting power is small, and in suburban and ruralareas where the number of mobile terminals is small, the range of thesector (transmitting power) is large. Accordingly, the range of the cell12 made up of six sectors is controlled by the power indicating signala.

By regionally and statistically limiting the number of accessible mobileterminals by such power control, the so-called traffic number iscontrolled. The reference SIR and reference RACH number forming thereference indicating signal b stored in the comparator 16 of the powercomputing unit 14 is pertinent to this traffic control. This point willbe further described later.

When each transceiver unit 13 receives the access from a mobile terminalexisting in the corresponding sector, it measures the reception signalto interference ratio (hereinafter referred to as “reception SIR”). Thetransceiver unit 13 supplies the measured reception SIR to thecorresponding power computing unit 14.

The power computing unit 14 stores the reception SIR supplied from thetransceiver unit 13 in the memory of the comparator 16. The comparator16 compares the stored reception SIR with the reference SIR. Thecomparator 16 determines whether the reception SIR is larger or smallerthan the reference SIR. And, if the reception SIR is smaller than thereference SIR, it inputs a plus compare signal e to the correctionamount computing unit 17, and if the reception SIR is larger than thereference SIR, it inputs a minus compare signal e to the correctionamount computing block 17.

The correction amount computing block 17 computes the correction amountbased on the inputted compare signal e, and inputs a correction signal findicating the computed correction amount to the adder 18. The adder 18adds the correction amount of the correction signal f to the CPICHtransmitting power supplied from the RNC through the power control unit15, and supplies the power indicating signal d of the corrected CPICHtransmitting power to the transceiver unit 13 and the power control unit15.

As a result, if the reception SIR is smaller than the reference SIR, orif the mobile terminals in the sector are less than the reference, thepower computing unit 14 performs control to increase the down-linktransmitting power to widen the range of the sector. Conversely, if thereception SIR is larger than the reference SIR, or if the mobileterminals in the sector is more than the reference, the power computingunit 14 performs control to reduce the down-link transmitting power tonarrow the range of the sector.

In this case, the power computing unit 14 controls the transmittingpower to mobile terminals for each period of a slot, which is apredetermined amount of transmit/receive data, or a frame consisting ofplurality of slots, for the CPICH transmitting power given from thepower control unit 15. Further, the down-link power control by theindividual power computing unit 14 is autonomously performed.

If the power control unit 15 is supplied with the power indicatingsignal d after correction from any power computing unit 14, it performspower control in the adjacent sectors. FIG. 7 is a flowchart showing theoperation of the adjacent sector control processing. First, the value ofa pointer n specifying a sector is set to 1 to specify the sector 1(step ST11). And, the loop of steps ST12 to ST15 is repeated whileincrementing the pointer n.

That is, it is determined whether or not the CPICH transmitting power ofthe sector (n) specified by the pointer n has changed (step ST12), andif there is no change, the value of the pointer n is incremented (stepST13). And, it is determined whether or not the value of n has exceeded6 (step ST14). If the value of n is 6 or smaller, the process goes tostep ST12 to determine whether or not the CPICH transmitting power ofthe sector (n) has changed. If the CPICH transmitting power has changed,the CPICH transmitting power of the adjacent sectors is controlled bythe RNC within the range of the specified maximum/minimum CPICHtransmitting power (step ST15).

As obvious from the foregoing, in accordance with the embodiment 1,since there are provided the power computing unit 14 for controlling thetransmitting power to a mobile terminal accessing one task according toa control command when radio communication is performed between a mobileterminal in one sector, and the power control unit 15 for collectivelycontrolling the transmitting power to mobile terminals in the cell 12 ofa plurality of sectors by giving a control command to each of theplurality of power computing unit 14, there is an advantage thatreduction of interference and elimination of traffic maldistribution inthe cell consisting of a plurality of sectors can be accomplished.Further, there is also an advantage that sufficient traffic control canbe performed in a sector and a cell.

In the embodiment 1, since the power computing unit 14 controls thetransmitting power to a mobile terminal for each period of slot, whichis a predetermined amount of transmit/receive data, or a frameconsisting of a plurality of slots, for the CPICH transmitting powergiven from the power control unit 15, there is an advantage that thetransmitting power in a plurality of radio areas can be controlled athigh speed.

Further, in the embodiment 1, since the power control unit 15 isnotified of the number of mobile terminals received by each powercomputing unit 14, and determines a control command, or CPICHtransmitting power, to be given to each power computing unit 14 based onthe notification, there is an advantage that traffic load can bedistributed in a wide range.

Further, in the embodiment 1, since the power control unit 15 gives acontrol command to each power computing unit 14 so as to prevent theoccurrence of absence of transmitting power in the adjacent sectors in aplurality of collectively controlled sectors and overlapping oftransmitting power between the adjacent sectors, there is an advantagethat reduction of interference and elimination of trafficmaldistribution between the adjacent sectors can be accomplished.

Further, in the embodiment 1, since the power control unit 15 definesthe ranges of the maximum value and minimum value of the CPICHtransmitting power in each power computing unit 14, and if anyaccommodated power computing unit 14 autonomously performs power controlin the corresponding sector, then it controls the CPICH transmittingpower within the defined ranges for the power computing units 14corresponding to the sectors adjacent such sector, there is an advantagethat the transmitting power in each sector can be controlled at highspeed, and reduction of interference and elimination of trafficmaldistribution among cells consisting of plurality of sectors can beaccomplished.

Further, as a variation of the embodiment 1, the power control unit 15may grasp the information on the CPICH transmitting power in each powercomputing unit 14 to control the reference SIR and reference RACH numberin each power computing unit 14. In this case, there is an advantagethat optimum power control can be performed between the adjacent radioareas.

EMBODIMENT 2

FIG. 8 is a diagram showing the communication system in the embodiment 2for carrying out the present invention, and in the figure, 19 denotes anRNC (central control means), and 20 denotes three BTS's (power controlmeans) connected to the RNC 19. The respective BTS's 20 perform radiocommunication with mobile terminals in the respective correspondingcells 1, 2, and 3 (a plurality of radio areas). FIG. 9 is the powercomputing unit in the RNC 19 in FIG. 8, and in the figure, 21 denotes apower computing unit, 22 denotes a comparator, 23 denotes a correctioncomputing unit, and 24 denotes an adder. g to m1, m2, and m3 are signalsto be sent and received within the RNC 19 and between the RNC 19 and therespective BTSIs 20.

Now, the operation is described.

Sent to the RNC 19 from superordinate of the RNC 19 are the powerindicating signal g of the CPICH transmitting power, and the referenceindicating signal h consisting of the reference SIR and reference RACHnumber. That is, the control command set by superordinate is sent to thesubordinate RNC 19. The RNC 19 gives the received power indicatingsignal g and reference indicating signal h to the power computing unit21 within it. The power computing unit 21 gives the power indicatingsignals m1, m2, and m3 to the three BTS's 20, respectively, and storesthe reference indicating signal h in the memory (not shown) of thecomparator 22.

The respective BTS's 20 control the transmitting power or down-linktransmitting power to mobile terminals based on the power indicatingsignals m1, m2, and m3. Accordingly, the ranges of the three cells 1, 2,and 3 are controlled by the power indicating signals m1, m2, and m3,respectively. And, each BTS 20 measures the reception SIR when itreceives access from a mobile terminal existing in the correspondingcell. The measurement of the reception SIR allows the measurement of thenumber of mobile terminals existing in the corresponding sector. TheBTS's 20 send measuring signals i1, i2, and i3 representing the measuredreception SIR's to the RNC 19.

The power computing unit 21 of the RNC 19 stores the measurement signalsi1, i2, and i3 received from the respective BTS's 20 in the memory ofthe comparator 22. The comparator 22 compares the stored reference SIRwith the respective reception SIR's selected sequentially. Thecomparator 22 determines whether the reception SIR is larger or smallerthan the reference SIR. And, if the reception SIR is smaller than thereference SIR, it inputs a plus compare signal j (for instance, 1) tothe correction amount computing unit 23, and if the reception SIR islarger than the reference SIR, it inputs a minus compare signal j (forinstance, 0) to the correction amount computing unit 23.

The correction amount computing block 23 computes a correction amountbased on the inputted compare signal j, and inputs a correction signal krepresenting the computed correction amount to the adder 24. The adder24 adds the correction amount to the CPICH transmitting power suppliedfrom superordinate, and sends the power indicating signal (for instance,m2) of the corrected CPICH transmitting power to the BTS 20. Thischanges the transmitting power of the corresponding BTS 20, and therange of the corresponding cell (for instance, cell 2) changes. Further,also to the BTS 20 corresponding to the cells (for instance, cell 1 andcell 3 adjacent to that cell, the power indicating signals (forinstance, m1 and m3) of the corrected CPICH transmitting power are sent.

That is, the RNC 19 determines whether or not the CPICH transmittingpower has changed in a cell in any BTS 20, and if changed, it controlsthe CPICH transmitting power of the adjacent cells within the range ofthe maximum/minimum CPICH transmitting power specified by superordinate.

As obvious from the foregoing, in accordance with the embodiment 2,since there are provided the BTS 20 for controlling the transmittingpower to a mobile terminal accessing one cell according to a controlcommand when radio communication is performed between mobile terminalsin one cell, and the RNC 19 for giving a control command to each of aplurality of BTS's to collectively control the transmitting power tomobile terminals in a plurality of cells, there is an advantage thatreduction of interference and elimination of traffic maldistribution ina plurality of cells can be accomplished when radio communication isperformed between mobile terminals for each cell. There is also anadvantage that sufficient traffic control can be performed in a cell orin a plurality of cells.

Further, in the above embodiment 2, if the RNC 19 is made to correspondto the BTS 11 in the embodiment 1, and the plurality of BTS's 20 aremade to correspond to the power computing unit 14 in the embodiment 1,then each sector in the embodiment 1 corresponds to each cell in theembodiment 2. Accordingly, the effect of controlling the down-linktransmitting power to each cell and controlling the down-linktransmitting power to a plurality of cells in the embodiment 2 is thesame as the effect of controlling the down-link transmitting power toeach sector and controlling the down-link transmitting power to one cellconsisting of plurality of sectors in the embodiment 1.

INDUSTRIAL APPLICABILITY

As described above, the communication system and communication methodaccording to the present invention is suitable for a system in which onepower control means controls the transmitting power to a mobile terminalaccessing one sector (or cell) according to a control command when radiocommunication is performed between a mobile terminal in thecorresponding sector (cell), and the collective control means gives acontrol command to each of the plurality of power control means tocollectively control the transmitting power to mobile terminals in aplurality of sectors (cells), thereby for accomplishing reduction ofinterference and elimination of traffic maldistribution in the pluralityof sectors (or cells) when radio communication is performed betweenmobile terminals for each sector.

1. A base station, comprising: a plurality of transceivers configured totransmit to mobiles in an area, each of said plurality of transceiversconfigured to transmit in a respective sub-area of said area; aplurality of transmitting power controllers, each of said plurality oftransmitting power controllers controlling transmitting power of arespective one of said plurality of transceivers, each of said pluralityof transmitting power controllers controlled with an identical powerindicating signal; and a collective controller for giving said identicalpower indicating signal to each of said plurality of power controllers.2. The base station according to claim 1, wherein said area is a cell,and said sub-area is a sector of said cell.
 3. The base stationaccording to claim 1, wherein said area is a plurality of cells, andsaid sub-area is one of said plurality of cells.
 4. The base stationaccording to claim 1, wherein said power controller is configured tocontrol transmitting power of a common pilot channel transmitting powerfor each period of a slot which is a predetermined amount oftransmit-receive data, or each period a frame consisting of a pluralityof slots.
 5. The base station according to claim 1, wherein saidcollective controller comprises: means for determining the identicalpower indicating signal based on a number of mobile terminals servicedby each power controller.
 6. The base station according to claim 1,wherein said collective controller comprises: means for providing saididentical power indicating signal to each power controller so as toprevent an absence of transmitting power between adjacent sub-areas andan overlap of transmitting power between adjacent sub-areas.
 7. The basestation according to claim 1, wherein said collective controllercomprises: means for receiving information concerning a common pilotchannel transmitting power in each of said plurality of powercontrollers, and means for controlling a reference signal tointerference power ratio and a reference number of random accesschannels in each of said plurality of power controllers.
 8. The basestation according to claim 1, wherein the collective controllercomprises: means for defining a range of a maximum value and a minimumvalue of the common pilot channel transmitting power in each of saidplurality of power controllers, and means for controlling within saidrange, if a power controller autonomously performs power control in onesub-area, the common pilot channel transmitting power of a powercontroller corresponding to an adjacent sub-area.
 9. The base stationaccording to claim 1, wherein each of said plurality of transmittingpower controllers comprises a feedback to said collective controller,and said collective controller is configured to adjust a power of onetransceiver based on feedback from an adjacent transceiver.
 10. The basestation according to claim 1, wherein each of said plurality oftransmitting power controllers comprises: a power indicating signalinput configured to receive the identical power indicating signal fromsaid collective controller; a reference signal input configured toreceive a reference signal from said collective controller; a feedbacksignal input configured to receive a feedback signal from a respectivemobile; a comparator connected to each of said reference signal inputand said feedback signal input, and configured to output on a comparatoroutput a compare signal based on a comparison of a reference signal anda feedback signal; a correction amount computer connected to saidcomparator output and configured to output a transmission powercorrection signal on a correction amount computer output; and an adderconnected to said power indicating signal input and to said correctionamount computer output, and configured to output a transmitting powercommand signal based on an addition of said transmission powercorrection signal and said identical power indicating signal.
 11. Thebase station according to claim 1, wherein each of said plurality oftransmitting power controllers further comprises: a collective controlfeedback configured to relay said transmitting power command signal tosaid collective controller.
 12. A mobile communciations method,comprising; transmitting from a base station to an area with a pluralityof base station transceivers, each of said plurality of base stationtransceivers transmitting to a respective sub-area of said area; andcontrolling transmitting power of each of said plurality of base stationtransceivers with an identical power indicating signal, each of saidplurality of base station transceivers having a respective powercontroller controlled by said identical power indicating signal.
 13. Themobile communications method according to claim 12, wherein said area isa cell, and said sub-area is a sector of said cell.
 14. The mobilecommunications method according to claim 12, wherein said area is aplurality of cells, and said sub-area is one of said plurality of cells.15. The mobile communications method according to claim 12, wherein saidstep of controlling transmitting power comprises: controllingtransmitting power of a common pilot channel transmitting power for eachperiod of a slot which is a predetermined amount of transmit-receivedata, or each period a frame consisting of a plurality of slots.
 16. Themobile communications method according to claim 12, wherein said step ofcontrolling transmitting power comprises: controlling said transmittingpower based on a number of mobile terminals serviced by each of saidrespective power controllers.
 17. The mobile communications methodaccording to claim 12, wherein said step of controlling transmittingpower comprises: preventing an absence of transmitting power betweenadjacent sub-areas and an overlap of transmitting power between adjacentsub-areas.
 18. The mobile communications method according to claim 12,wherein said step of controlling transmitting power comprises: receivinginformation concerning a common pilot channel transmitting power in eachof said respective power controllers, and controlling a reference signalto interference power ratio and a reference number of random accesschannels in each of said respective power controllers.
 19. The mobilecommunications method according to claim 12, wherein said step ofcontrolling transmitting power comprises: defining a range of a maximumvalue and a minimum value of the common pilot channel transmitting powerin each of said respective power controllers, and controlling withinsaid range, if a power controller autonomously performs power control inone sub-area, the common pilot channel transmitting power of a powercontroller corresponding to an adjacent sub-area.
 20. The mobilecommunications method according to claim 12, wherein said step ofcontrolling transmitting power comprises: comparing a feedback signalwith a reference signal to provide a comparison signal; and adjustingsaid transmitting power based on said comparison signal.